Oft, when my lips I open to rehearse
Thy wondrous spells of wisdom and of power,
And that my voice and thy immortal verse
On listening ears and hearts I mingled pour,
I shrink dismayed—and awful doth appear
The vain presumption of my own weak deed;
Thy glorious spirit seems to mine so near,
That suddenly I tremble as I read—
Thee an invisible auditor I fear :
Oh, if it might be so, my master dear!
With what beseeching would I pray to thee,
To make me equal to my noble task,
Succour from thee, how humbly would I ask,
Thy worthiest works to utter worthily.

Frances Anne Kemble

http://www.poemhunter.com/poem/to-shakespeare-ii/